Python3.4图片转换素描

 from PIL import Image, ImageFilter, ImageOps

    img = Image.open('C:\Users\hengli\Pictures\lovewallpaper\214926-106.jpg')

    def dodge(a, b, alpha):

        return min(int(a255/(256-balpha)), 255)

    def draw(img, blur=25, alpha=1.0):

        img1 = img.convert('L')        #图片转换成灰色

        img2 = img1.copy()

        img2 = ImageOps.invert(img2)

        for i in range(blur):          #模糊度

            img2 = img2.filter(ImageFilter.BLUR)

        width, height = img1.size

        for x in range(width):

            for y in range(height):

                a = img1.getpixel((x, y))

                b = img2.getpixel((x, y))

                img1.putpixel((x, y), dodge(a, b, alpha))

        img1.show()

    #img1.save('C:\\Users\\hengli\\Pictures\\CameraMan\\照片1.png')  
draw(img)  </pre>